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The following anti-phosphor-antibodies were used: pPLC��1 (Tyr783), pPLC��2 (Tyr1217), pAkt (Ser473), pPKC (pan), pPKC�� (Thr505), pErk1/2 (Thr202/Tyr204), pJnk (Thr183/Tyr185), p-p38 (Thr180/Tyr182), pI��B�� (Ser32), and pIKK��/�� (Ser176/180) from Cell Signaling Technology. pSNAP-23 (Ser95) was a generous gift from Dr. P. Roche, NCI [32]. Anti-Lipin1 and Lipin2 antibodies were from Santa Cruz Biotechnology. For the loading control, antibodies for total proteins or ��-actin were used. In the stimulation assay, IgE-sensitized BMMCs were resuspended in Tyrode's buffer, and then were left unstimulated or stimulated with DNP-HSA (20 ng/mL) for the various MG-132 times indicated. RNAs extracted using Trizol Reagent (Invitrogen) were reverse transcribed to cDNA by Superscript III and random primers according to the manufacturer's protocol (Invitrogen). qRT-PCR was performed with Mastercycler realplex and SYBR Green master mix (Eppendorf). The expressed levels of target mRNAs were normalized with L32, calculated using the 2?����CT method and presented as arbitrary units (a.u.) of fold change. BMMCs were sensitized with 1 ��g/mL IgE for 6 h, resuspended at 1 �� 107 cells/mL in Tyrode's buffer containing 3 ��g/mL Indo-1 (Invitrogen) and LY2835219 molecular weight 4 mM probencid, further incubated for 30 min at 37��C, and washed twice with Tyrode's buffer. A total of 40 ��l of cells was added into 460 ��l of pre-warmed Tyrode's buffer to determine the calcium response by flow cytometry. After deter-mination of the baseline ratio of FL5 to FL4, cells were stimulated with 10 ��l of 5 ��g/mL DNP-HSA. Calcium flux was displayed as the ratio of FL5 to FL4 fluorescence. Retrovirus was made using pMX-CD63-GFP, kindly provided by Dr. W. Zhang, Duke University according to the method previously described [60]. Isolated BM cells were grown in IMDM-IL3 medium for 3 days. The cells (3 �� 106 cells/mL in 24 wells) were mixed with an equal volume of CD63-GFP retroviral supernatant and polybrene (8 ug/mL), and then centrifuged at 2500 rpm for 90 min at room temperature using a Sorvall Swing Bucket rotor. After spin infection, the CAL-101 cells were further cultured in IMDM-IL3 medium for 4 weeks. The transduced BMMCs were loaded with anti-DNP-IgE and stimulated with DNP-HSA for the indicated times. Cells were immediately fixed with 4% paraformaldehyde and permeabilized with 0.1% Triton X-100 followed by incubation with a rabbit anti-lipin1 antibody (Cell Signaling Technology) for 1 h. The bound antibody was labeled with Texas Red-conjugated anti-rabbit secondary antibody (Molecular Probes) for 1 h and then visualized under Leica SP5 confocal microscopy. For statistical analysis, a two-tailed Student's t-test was performed. *p